1GB DDR333 PC2700 ECC Registered (major brand) Double data rate is a type of SDRAM in which data is sent on both the rising and falling edges of clock cycles in a data burst. It is usually referred to as DDR as opposed to DDR SDRAM. ECC means that the memory checks for any data errors within the data flowing through it and tries to correct this accordingly. ECC memory is mainly used in very high end systems or servers.

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